0,2

Column 3 of Marshall table, p.443. A143093 is the analogous enumeration, column 2 of Marshall table, if we view the K-structures as graded rings with distinguished element.

Murray Marshall, Book Review: Valuations, orderings, and Milnor K-theory, by Ido Efrat, Bulletin of the American Mathematical Society, Vol. 45 (July 2008) No. 3, pp. 439-444.

Ido Efrat, Valuations, orderings, and Milnor K-theory, Mathematical Surveys and Monographs, vol. 124, American Mathematical Society, 2006.

a(n) = the number of nonisomorphic elementary types K_*(F)/S with |F^X/S| = 2^n, if we we view the K-structures just as graded rings.

Cf. A143093.

Sequence in context: A122392 A139782 A071731 this_sequence A058495 A071735 A013560

Adjacent sequences: A143091 A143092 A143093 this_sequence A143095 A143096 A143097

more,nonn

Jonathan Vos Post (jvospost3(AT)gmail.com), Jul 23 2008